I have Create custom CSV import functionally. But How to check which row data is blank and i want to show error like :- Required field is empty in row(s). So Please help me how to check which row is blank in import CSV.
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You need to create import.xml file and handle all validation logic in php file You can refer to this article https://magecomp.com/blog/import-csv-file-to-custom-table-magento-2/